Method for recovering hydrogen from tail gas of chlorate electrolysis

A technology of chlorate electrolysis and tail gas recovery, which is applied in the field of fine chemical hydrogenation, which can solve the problems of poor use of deoxidation catalyst, poor quality of recovered hydrogen, and non-continuous recovery, so as to achieve better oxygen removal effect and ensure safe production , The effect of eliminating chlorine pollution

Inactive Publication Date: 2013-08-21
HEBEI YUSN CHEM GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that there are no enterprises in my country that recover hydrogen from chlorate and use hydrogen for fine chemical hydrogenation.
In addition, due to problems in the production process, hydrogen recycling m

Method used

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  • Method for recovering hydrogen from tail gas of chlorate electrolysis
  • Method for recovering hydrogen from tail gas of chlorate electrolysis
  • Method for recovering hydrogen from tail gas of chlorate electrolysis

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Embodiment 1

[0044] Adopt process of the present invention to process the electrolysis tail gas of a certain factory, the relevant data before and after treatment are shown in Table 1 (both volume content):

[0045]

[0046] Table 1

[0047] It can be seen from Table 1 that it can meet the relevant requirements of the national standard first-class industrial hydrogen.

Embodiment 2

[0049] A furfuryl alcohol Co., Ltd. in Xingtai is an enterprise that hydrogenates furfural to produce furfuryl alcohol. It needs a large amount of high-quality hydrogen and relies on electrolysis of water to produce hydrogen, which is costly. Later, it was decided to adopt the process of the present invention to thoroughly control the electrolysis tail gas, reclaim valuable H 2 resources to achieve zero exhaust emissions. The process of the present invention has been implemented since May 2001, and has been put into trial operation in January 2002. The whole process equipment runs smoothly, the workers are easy to operate, and a total of 6 million Nm of hydrogen is recovered. 3 , It has created better economic benefits for the enterprise, and also completely changed the environment, and achieved better social benefits.

[0050] We sent the above-mentioned recovered hydrogen to the Henan Provincial Bureau of Quality and Technical Supervision for testing (designated nationwide)...

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Abstract

The invention discloses a method for recovering hydrogen from tail gas of chlorate electrolysis. The method comprises the following steps of: removing chlorine and carbon dioxide; removing vapour; removing oxygen, namely, conveying the defoamed gas into a first oxygen remover, enabling hydrogen with oxygen to react to remove most of oxygen, conveying a high-temperature gas at 360-420 DEG C after oxygen removal into a heat exchanger to cool, conveying a cooled gas into a third water-cooling tower, conveying 70% (V/V) hydrogen into a heat exchanger tube to exchange heat with an inter-tube gas, increasing the temperature of the gas to a temperature of greater than 200 DEG C, conveying the gas into a second oxygen remover, reducing the content of oxygen in hydrogen to be less than 0.1%, and finally cooling to a temperature of lower than 30 DEG C via a fourth water-cooling tower and conveying hydrogen in a gas cabinet; and compressing and bottling the qualified hydrogen after being treated. The method disclosed by the invention is simple to operate during startup and shutdown, strong in adaptability, reasonable in process design, high in purity of the recovered hydrogen, higher in quality of hydrogen via secondary oxygen removal, and wider in the application of hydrogen and has an oxygen removal effect.

Description

technical field [0001] The invention relates to a process for recovering hydrogen from electrolytic tail gas in chlorate production, and is especially suitable for a technique for recovering high-purity hydrogen for fine chemical hydrogenation. Background technique [0002] The production of chlorate is based on saturated brine as raw material, which is prepared electrochemically in an electrolytic cell without a diaphragm, and the anode reaction is mainly Cl - The electrons are lost to generate chlorine gas, which is circulated and absorbed in the electrolytic cell with the electrolyte, and sodium chlorate is generated under the condition of 80°C. The cathodic reaction is mainly H + Electrons are obtained to generate hydrogen, which is evacuated with the tail gas. If the hydrogen in the tail gas is not recovered, the electric energy consumed by the half-reaction of the cathode of the electrolyzer will be wasted in the form of hydrogen venting, which is really a pity. [...

Claims

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Application Information

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IPC IPC(8): C01B3/50
Inventor 侯平香肖振福杨海斌郭宝江王明庆刘拉平霍彦雷
Owner HEBEI YUSN CHEM GROUP
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